Calculation of the heat impacts of a biogas flare
The CERC consultancy team recently completed a heat impact assessment for an enclosed biogas flare using ADMS 5. We assessed the worst case heat impact of the proposed flare on adjacent site buildings. The results informed the choice of a safe combustion chamber height for the flare installation.
The flare source characteristics were based on typical biogas compositions for minimum and maximum methane contents, a range of combustion conditions, and sensitivity for stack downwash assumptions.
ADMS 5 includes a temperature and humidity output option. The plume temperature output from this model option was used to calculate the convective heat impact. The first figure shows plume centreline temperature with downwind distance. The similar temperature drop-offs with distance for all flare source scenarios highlighted that plume height is expected to have the biggest effect on heat impact at nearby buildings.
We used standard fire safety methods to calculate the radiative heat impact. The second figure shows the dependence of relative combustion chamber height on radiative heat impact at the top of a building wall facing the flare chamber, the differences in heat impact are most significant at locations close to the flare.
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